Chapter 13: Inferential Statistics and Distributions
223
Z-Test
Z-Test
(one-sample
z
test; item
1
) performs a hypothesis test for a single unknown population
mean
m
when the population standard deviation
s
is known. It tests the null hypothesis H
0
:
m
=
m
0
against one of the alternatives below.
•
H
a
:
mƒm
0
(
m
:
ƒm
0
)
•
H
a
:
m
<
m
0
(
m
:<
m
0
)
•
H
a
:
m
>
m
0
(
m
:>
m
0
)
In the example:
L1={299.4, 297.7, 301, 298.9, 300.2, 297}
Note:
All
STAT TESTS
examples assume a fixed-decimal mode setting of 4 (Chapter 1). If you set
the decimal mode to
Float
or a different fixed-decimal setting, your output may differ from the
output in the examples.
Data
Stats
Input:
Calculated
results:
Drawn
results:
